Starting with more real-life Calvin and Hobbes snowmen, these are worth the effort to make!
Why bother with "normal" snowmen? This is what happens when imagination meets precipitation at a particular atmospheric temperature and dew-point.... Click the source link for all of them (not all are SFW-ish...)
Older (related) links -> http://www.dannyfinnegan.com/2011/12/tribute-to-calvin-style-snowmen.html & http://www.dannyfinnegan.com/2011/01/7-snowmen-that-would-traumatize.html
Source -> http://www.happyplace.com/12689/hilariously-disturbing-snowmen-we-hope-never-come-to-life